Neither is usually used when talking about two people or two groups of people. Example: Neither of the two sisters could attend their cousin's wedding.
None is usually used when talking about more than two people, or all of the people. Example: None of her relatives wanted to go to the wedding.
None
None. They are the same angle.
None. A set is a collection and a collection is a set.
well a polygon has angles and a curve has none.
None
None.
none
none
None
none
none
None.
I don't think there is a difference.
none
none
there is none
NONE